LargeEddy Simulation of A Pulsatile Flow in A （LargeEddy模拟脉动的流的）.pdfVIP

Large-Eddy Simulation of A Pulsatile Flow in A Channel with Both-Sided Constrictions Afzal Hossain, Bing-Chen Wang∗ and Md. Mamun Molla Dept. of Mechanical Manufacturing Engineering, Univ. of Manitoba Winnipeg, MB, R3T 5V6, Canada Email: bc_wang@umanitoba.ca ABSTRACT cross-sectional area of a vessel, however, this physical In this research, we numerically investigate the physics mechanism is further complicated by unsteady of a physiological pulsatile flow confined within a pulsations of the flow. Owing to the fast evolution 3D channel with an idealized stenosis formed sym- of computational technology and the need for deeper metrically on both the top and bottom walls using insights into the physics of laminar-turbulent transition the method of large-eddy simulation (LES). The ad- flows through an arterial stenosis, the past decade vanced dynamic nonlinear subgrid-scale stress (SGS) has witnessed a rapid advancement in numerical model (DNM) of Wang and Bergstrom [22] is imple- modelling of physiological pulsatile flows through mented in the current LES approach. The Womersley different types of stenoses. number tested in the simulation was fixed at 10.5 In literature extensive experimental studies have and the Reynolds number tested was set to 1800, been reported which provide insights into the physical which are characteristics of human blood flows in mechanism underlying transition-to-turbulent flows large arteries. An in-house computer code based on through arterial stenoses. Most of the experimental curvi